Before they were dating Booker, Joe and Nicky were just dating each other. Booker loves them, but can get really insecure about where he fits into the relationship. Preference for a mortal AU where thruples are common.

+Joe & Booker were uni BFFs before they met Nicky (they have a tendency to vibe as rowdy frat boy besties, so when they kiss people are like ??? but then realise that it makes perfect sense)
+++Nicky is comfortably quiet in his love for Joe but makes an effort to be obvious with Booker
++++++Despite all Booker’s insecurity, the reality is they’re gross and domestic
++++++++++++++Bottom Joe